The W boson spin density matrix at OPAL

Date

2008-04-10T05:58:13Z

Authors

Bailey, Ian Richard.

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Abstract

The spin states of W bosons in e+e- -t W+W- -t q$tvc events recorded by the OPAL detector at LEP are determined by an analysis of the angular distributions of their d e cay products. This information is used to calculate polarised differential cross-sections and to search for CP-violating effects. Results are presented for W bosons produced in e+e- collisions with centre-of-mass energies between 183 GeV and 209 GeV. The average percentage of longitudinally polarised W bosons measured from the data is found to be (23.9 f 2.1 + 1.1)% compared to a Standard Model prediction of (23.9 f 0.1)%. All results are consistent with CP conservation.

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